Reverse control for motors



1,629,989 M. BROWN REVERSE CONTROL FOR MOTORS May 24, 1927.

Filed Aug. 22, 1925 242 ZZ\ 17 lllffllllkmllm 171 .2. i5 Z1 15/ J4 9 W!W I 16 0 Z9 Z0. 1 V 10 5/ 164 19 J? Imam/Z 071 [Wax 570x070,

. be cheaply manufactured Patented May 24, 1927.

UNITED STATES PATENT OFFICE.

MAX BROWN, or CHICAGO, ILLINOIS.

REVERSE CONTROL FOR MOTORS.

Application filed August 22, 1925. Serial No. 51,885.

My invention appertains generally'to a motor reverse control, and moreparticularly lo such a control for electric motors employed inconnection with the operation of throingh the neutral position to theother extreme position, such quick movement of the lever causing a toorapid reversal of the electric motor and frequently causing seriesdamage thereto. A sudden reversal of the direction of current in themotor armature by such rapid and uninterrupted movement of the controllever will blow out fuses; will stop the elevator out the motorarn'iature; and will cause arebetween floors; will burn ing in switchesand across the motor commutators, all of which, obviously necessitateexpenditure for repairs and cause needless delay.

The main object of my invention, accordingly, is to provide aninterrupting and retar-ding means for control levers of the classdescribed, which will prevent a rapid reversal of the motor, by causingthe lever to come to a substantial rest in neutral position.

Another object is to provide a simplified control box embodying a leverinterrupting and retarding means for the purpose mentioned. 7

Still another object is to provide such an interrupting and retardingmeans which may and may be readily fitted to standard controls now inuse.

Other advantages and objects will be apparent to those skilled in thisart as the description hereof progresses.

These objects are accomplished by the improved control means hereinafterdescribed and which including an independently movable operating handlecarried on a lever pivotarllyv inounted on the box, said lever carryinga guide in the form of a roller member, the lever being movable to closecontacts for operating a motor to raise or lower an elevator or lift.Mounted on the control box in the path of movement of the guide orroller, and in the neutral lever, there is guide plate embodying fea-.tures for interrupting the continuous movement of the lever toretard'it and prevent rapid reversal of the motor.

terrupting and retarding briefly embodies a control box at 23 in Fig. tso they position of the.

In the accompanying sheet of drawings, to which reference should now bemade, and wherein like parts are denoted by like'reference characters, I

Fig. 1 is a face plain box and lever showing view of a control theimproved inmeans in position; Fig. 2 is a top plan view. ofthe samemechanism;

Fig. 3 is a vertical sectional view through the control box andoperating handle or lever and is taken alongthe line 3-3 of Fig.1,

looking in the direction of the arrows;

.Fig. 4: is a perspective view of the retarding means or guide plate andFig. 5 is a top plan view of said plate. Looking to Figs. 1, 2 and 3,there is illustrated a conventionalface member 10 of a control box ofthe type mentioned, said member being rounded in the usual way alon itsupper edge and centrally and pivotally carrying on a pivot 11, the usuallever 12 adapted to be swung either to the right or to the left as iscommon in this art. integrally formed on the lever below its pivot isthe customary segmental contact 13 engageable with the contacts 14 01 15for closing the circuit with the motor to operate the lift in either anup or a down direction. I

The member 10 carries on its back side and centrally thereon at its topa plate 1.6 to which is bolted the improved retarding and guiding platel7 of this invention, said plate restingon the top side of the member10, as shown. This guide member 17 isprovided with a centrally disposedpocket 18 con'imunicating with an olfsetpassageway 19 arranged forwardlythereof and extending to the right shown, said passageway being closedat one end and merging into a camming or guide face 20 at the oppositeend "where said passageway is open. Similarly, there is disposedrearwardly of the pocket 18, an oppositely disposed passageway 21 alsoclosed at one end and open at the other end, where there is anothercamming or guiding portion 22. The camming portions 20 and '22 arepreferably rounded at their upper edges as indicated generally betterperform their guiding function as will presently appear. Centrallydisposed inthe pocket 18 there is arranged a pair of yieldable, spaced,stop members 24L for a purpose soon to appear. The lever 12 carries inany suitable manlit) ner, a forwardly projecting operating handle 25,centrally and axially bored out to receive a plunger 26 made fast on thelever 12 in a manner, by means of thespring 27, to permit an independentor relative movement of the handle 25 with respect to said lever 12. Thehandle is provided with a roller 28 having a guide flange 29 so disposedthat it may pass through the pocket 18 and passageways 19 and 21 in theguide plate 17. A collar 30 holds the roller 28 in place.

In the operation of this control means, let us suppose the lever 12 isswung from the far left hand dotted position in Fig. 1 towards the rightto reverse the motor and the direction of movement of the lift. Theguide flange 29 and roller 28 move with the handle 25, the flangeentering the passageway 21 and being guided thereinto by the cam face22, the roller 28 and flange 29 having a rolling contact with the roundedged cam face to reduce shocks. The handle 25, of course, has anindependent movement due to the plunger and spring construction shown.The handle will be interrupted in its continuous movement by the closedend of the passageway adjacent the pocket 18, and the operator tocontinue the movement must then pull the handle outwardly across saidpocket with the flange 29 furthermore being yieldingly retarded by themeans 24, and into the passageway 19 and then through said passageway tocomplete reversed position. The interruption and retardation by theoffset passageways and yielding means 2% will be suflicient to bringthemotor to rest to prevent its rapid reversal and thereby giveassurance that carelessness will notcause damage to the motor with itsconsequent costly delays. F urthermore,if it is desired to retain thelever in neutral position the flange 29 will be held' locked yieldinglyin such position against accidental displacement in all directions bythe stop means 2et as shown in Fig. 3 and the ends of the pocket 18 aswill be obvious. If it is desired to move thelever 12 from the extremeright hand position as viewed in Fig. 1, obviously the other cam face 20comes into play to guide the roller 28 and flange 29 properly.

It will thus be seen that there is herein provided apparatus in whichthe several objects of this invention are achieved, and that the same isof simple construction, yet dependable in operation, and is well adaptedto meet the exacting conditions of hard practical use.

IVhile I have shown the preferred form of the invention, it is to beunderstood that the same may be useful in other connections, and thatvarious changes in form, construction and arrangement of parts may beresorted to without departing from the spirit and scope of thisinvention as hereinafter claimed.

hat I claim is:

1. In a reverse control for motors, the combination with the control boxand lover, of an independently movable operating handle carried by thelever, and a guide plate disposed on the box including means forinterrupting the continuous movement of the lever and yieldingly lockingit in neutral position against accidental displacement in alldirections.

2. In a reverse control for motors, the combination with the control boxand lever, of an independently movable operating handle for the lever, aguide plate having otlset, oppositely disposed passageways forinterrupting continuous movement of the lever through its neutralposition. and yielding means arranged between the passageways forfurther retarding continuous movement of the lever.

3. In a guide member of the character described, the combination oii aplate having a central pocket, passageways on opposite sides of thepocket and communicating therewith, said passageways leading in oppositedirections from the pocket. and yieldable stops arranged in the pocket.

4. In a guide member of the character described, the combination of aplate having a central pocket, passageways on opposite sides of thepocket and communicating tlierewitlnsaid passageways leading in 0ppositedirections from the pocket and having their entrances provided withcumming surfaces, and spaced yieldable stops mounted in the pocket.

Signed at Chicago, in the county of Cook, and State of Illinois, this18th day of August, 1925.

MAX BROWN.

